Triple SU's

[Zedrally]

Triple Webber's, Miki's etc,etc.
But are triple stock SU's a possible upgrade?
Has anyone done it?:tapemouth

[halz]

Good point. I know that e-type Jags have a triple SU setup...

[2ManyZs]

I saw a Z with a triple SU set up in the old Z car magazine. Looked pretty good, except for the fact the manifold had to be fabricted form scratch, luckily the guy that did it had a father who owned a shop that was capable of melting down scrap aluminum and cast him a new one. The car was up for sale on Ebay not long ago, but don't know if it sold or not. it really was a sweet car. If I remember right he had used a 240 crank in a 280 block for a really short stroke, high revving engine. I'll look for the mag when I get home and try to post a little more info.

[laffeaux]

Seeing triple SUs on a Z would be kind of cool. However, I'm not sure you'd ever get a 2.4L motor to need so much air that the extra carb would help much - I guess when you were turning 8000 RPMs you could have all three carbs half open?

[ZmeFly]

over at www.zhome.com


apparently it doesnt work to well

[Zedrally]

Probably not as noticable on a 240, however once you move to a 280 I would suspect that there would have to be a difference.
Reading between the lines of your reply, I'm getting the feeling that your of the opinion that triple carbs on a 240 would be a waste of time and money?
I guess it opens up a can of worms, is there anyone out there that did just that, without altering any other aspect of the engine and can comment on the performance aspect?

[Cuong Nguyen]

Hi all,

I have just uploaded a couple of triple SU carbies conversion for a 6 cylinder L series engine from my image collection.

On is of the manifold and the other is the whole package on the engine.

[Zedrally]

Cuong,
Could you upload these photo's to this thread?

[smg1404]

I have been running the tripple Webers, with the only other mod being headers. I can assure you that there is a performance improvement.. Though I can not say how much.. The biggest thing I see is much is the engine is a much more responsive throttle... And of course they sound great.

[240znz]

Why would you want to? If the answer is because you can.... then great...go empty your wallet.

Triple side drafts are a proven mod and most likely a cheaper option.

The standard SU will flow pretty well with different jets even with a standard L28. But if you have a wild L28 then get the bored by Rebello. Not sure how much they charge but might be worth a email query to them though.

Stick with the obvious.

Just my 2cents......:classic:

[laffeaux]

My opinion on the triple carbs is as follows:

A 2.4 litre engine is cable of processing 296.6 CFM of air at 7,000 RPM. A stock Hitachi SU will flow at 150 CFM, and since there are 2 of them, that's 300 CFM. For a motor that can not turn more than 7K RPM. what good will the 3rd carb do? (Unless you have a more direct air path to the cylinder, maybe.)

If the engine turned 8,000 RPM, the engine can process 339 CFM of air - in that case more carburation is needed, and Triple SUs would be a cool set up.

So my opinion is that unless you're making major engine changes, a triple carb set up is overkill.

[santamaus]

Is there an easy calculation for this? (Displacement x rpm x 0.5?) Trying it now...

[santamaus]

heh... answered my own question I guess...

(2400 cc/2 rev)(1 in/2.54 cm)^3(1 ft/ 12 in)^3(7000 rev/min)=296.6 cfm

or.. displacement cc/8.090=cfm@7000rpm

321 cfm for a 260, 346 cfm for a 280, and--383 cfm for 3.1L!

A link to rebello--with the page of their carb mods:
http://www.rebelloracing.com/prod03.htm

Have fun!
Chris

[Cuong Nguyen]

Sure zedrally,

if you give me some brief tips on how to do it I will be glad to post the pics. (the images are currently on my hard drive, not a web page)

Sorry for the ignorant question!!!

[Zedrally]

Sure,
Go to post reply and scroll down. Use the attach file feature.
MN

[Cuong Nguyen]

Hi all,

here is a triple SU set up on a L series

zedrally>> how stupid of me, but of course that how its done!!!

[Cuong Nguyen]

here is the triple SU manifold used

[Zedrally]

Pretty neat!
Now that you've started with the pic's, how about the rest.
Does the setup still exist?
Was it succesfull?
What else can you tell us about it?

[Cuong Nguyen]

Hi zedrally,

unfortunately I don't have any info on the car or how it runs!!!

I just got the images stored on my harddrive from browsing the net....

Has anyone else has tried triple SU carbs before?